SC Cup I is part of the Swisscubing Cup 2018, made of 4 competitions during the whole year. Check out on https://swisscubing.ch/en/swisscubing-cup-2018/ for the details of the other editions. A competitor who registers and doesn't show up at the competition will have to pay that registration fee at his next competition in Switzerland.

Create a WCA account here if you don't have one.
If this is not your first competition, associate your WCA ID to your WCA account here.
Register for this competition here.
The base registration fee for this competition is CHF15 (Swiss Franc).